/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineExternalUIInterface.h
Interface definition for the online services external UIs Any online service that provides extra UI overlays will implement the relevant functions
class IOnlineExternalUI
FOnCreateAccoun...
OnCreateAccountFlowUIRequiredDelegates
Delegate called when the online subsystem requires an external UI to handle account creation
FOnExternalUICh...
OnExternalUIChangeDelegates
Delegate called when the external UI is opened or closed
FOnLoginFlowUIR...
OnLoginFlowUIRequiredDelegates
Delegate called when the online subsystem requires an external UI to handle login flow